Renaming function contained @ in the DLL

Hello every one.I have a bunch of code . THis code connect t othe exteral library:
public interface TransToQuik extends Library{
public int _TRANS2QUIK_CONNECT@16(String lpcstrConnectionParamsString, LongByReference pnExtendedErrorCode, String lpstrErrorMessage, int dwErrorMessageSize);
LongByReference pnExtendedErrorCode= new LongByReference();
    String Error;
    int len;
    int FunctionResult=0;
    String lpstrErrorMessage="";
    int dwErrorMessageSize=0;
    TransToQuik lib = (TransToQuik) Native.loadLibrary ("D://java project//Robot//TRANS2QUIK.dll",TransToQuik.class);
   FunctionResult=lib._TRANS2QUIK_CONNECT@16("D://QUIK5.15//",pnExtendedErrorCode,lpstrErrorMessage,dwErrorMessageSize);
    System.out.println(lib);But it is do not work cause the JAVA do not understand function contained @ in the name. In iinteret i find no examples. Please help me.

For the future it would be useful to mention which libraries you use. In your case it seems to be JNA.
Since that function hasn't got a name that's a valid Java name, I doubt that you can easily call it like that.
But from the documentation it seems that there is at least one other way to call native functions with JNA:
[Create a Function object|https://jna.dev.java.net/javadoc/com/sun/jna/Function.html#Function(com.sun.jna.NativeLibrary,%20java.lang.String,%20int)] and call that objects invoke() method.
Edit: By the way, the name of the language and platform is "Java". It's not "JAVA", because it's not an acronym.

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Why does the DLL function executed by call library node fail when the Vi is re-opened?

Development System
OS: Windows XP
LabVIEW: version 10.0
DLL: Custom
Compiler: Visual C++ 6.0
Function Prototype: __declspec(dllexport) const char * test(void)
We have developed a DLL for use. The DLL compiles cleanly.  The DLL includes a function test.  The test function validates the functional capabilities of the DLL. I have followed the examples online, and I have used the import shared library tool in LabVIEW. The VIs created use the call library node.
When I create a VI calling the test function from the custom DLL using the call library node the VI executes the DLL function test flawlessly. I close the VI. When I re-open the VI and run it, I get an error code from the DLL.  However, if I go to the block diagram and set the path for the DLL in the configure call library node again then the VI executes the DLL function test flawlessly again.
I have to set the path for the DLL in the configure call library node every time I open the VI. The examples I downloaded from the community do not require this. What might the DLL be missing? What am I missing?
Solved!
Go to Solution.

I think it was rather unfair of me to ask for help with my DLL issue without disclosing more detailed information. As a corrective action, I have attached a zipped file. The zipped file contains the entire VC++ 6.0 project for compiling the DLL, the DLL, and the VI I have been using to test it.
###NOTE####
As a prerequisite to compilation and usage of the DLL you'll need to have installed Python 26 on your system.
You may obtain the MSI for correct version of Python from the following location:
http://www.python.org/ftp/python/2.6.6/python-2.6.6.msi
###NOTE###
Thank you very kindly for any assistance offered!
Thanks,
Bill
Attachments:
C_DLL_PYTHON_AND_LABVIEW2010.zip ‏1685 KB

DLL Adapter: Change function name & params without unloading the DLL

Hi,
I'm using teststand adapters API to dynamically build a DLL call step. Each dll function is called thru this "DLL Manager" sub-sequence.
Tried 2 methods (here is an abstract of the code):
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CommonCModule.ModulePath = myDllpath
CommonCModule.FunctionName = myFunction (note: this call unload the previously loaded DLL)
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2. Statement steps:
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Module -> LoadPrototype
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The two methods don't have exactly the same behavior, but work well for the 1st function that I call or work well if I unload the dll after step execute.
However, is there a way to use these steps (or others) to setup the step, but without unloading the DLL between each call. In my test sequence, I have to OpenConnection with the UUT before launching my commands, so the dll must not be unloaded to keep the connection opened...
e.g.
1) OpenConnection() => This function keeps the communication handle with the device
2) myCommand1()
3) myCommand2()
4) CloseConnection()
Thank you for help
C.
Solved!
Go to Solution.

Hi all,
To recap:
I'm looking for a method to dynamically loads and executes C/C++ DLL functions without unloading the DLL between each call. I already have a DLL manager that dynamically loads and executes dll functions, but it unloads the DLL between each call even if I set the unload option to: "Unload when sequence file is unloaded"...
The problem is:
When I change the name of the function to execute (using the CommonCModule.FunctionName property), teststand automatically unloads the DLL before applying the change. Therefore, I can't open a connection handle with my UUT using one function and sends my commands with the others...
To help you with the understanding of my issue:
I created a simple example that will let you experiment the problem that I try to describ... You will notify that TestStand unloads the dll even if I don't request it...
1) download the attached zip file
2) extract it anywhere
3) open sequence file "dll_called_dynamically.seq"
4) read comment of the first step of the sequence
>> To analyse the case:
>> 1) Break and run the sequence using step-by-step (use F10)
>> 2) Run one iteration of the loop to execute the dll once, ,
>> 3) Execute launch_listdlls.bat and verify in the outputfile.txt that the dll has been loaded (search for testlib.txt)
>> 4) Then, step over the step "Set Dll Function Name to call"
>> 5) Execute launch_listdlls.bat and you will notify that the dll has been unloaded... ...
The testlib.dll file provided in the zip file is a basic dll that I used to confirm my test engine. Mainly, it only performs additions on the variables passed as argument to the dll.
The provided batch file executes the free application ListDlls.exe and create an outputfile.txt listing all currently loaded dll.
Please note that I use TestStand 2013
Thank you very much for your help,
C.
Attachments:
dll_unexpected_unload_ex.zip ‏313 KB

Where is the DLL file that exports these functions?

I have been tasked with controlling a DAQCard E-series via program written in C. My development environment is MinGW on Windows 2000, with DAQ-MX and Traditional installed.
I started by using the MX example code as a foundation. Everything goes well it comes time to link the code; the linker can't find the exports defined anywhere.
E.g.: WriteDigPort_Fn.o : undefined reference to 'DAQmxCreateTask@8'
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My guess is these are properly defined in the (MSVC) .lib file supplied, but MinGW doesn't like it. I can build a definition file for this DLL that Min
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PS: Not part of my question, but for everyone searching here for info on NI DAQ + MinGW: MinGW defines 64-bit integer types using 'long long' instead of 'int64'. If you're getting errors referring to int64/etc., change the following lines in NIDAQmx.h:
//typedef __int64 int64; // replace this
typedef long long int64; // with this
//typedef unsigned __int64 uInt64; // and this
typedef unsigned long long uInt64; // with this

Greetings,
The NI-DAQmx ANSI C functions are contained within nicaiu.dll. This DLL should be available in the following location:
C:\WINDOWS\system32
Good luck with your application.
Spencer S.

How do I pass an array of structs to a C function using the dll flexible prototype adapter?

What I want to do is pass into a C dll function a variably sized Array of structs of type TPS_Data. My Code compiles but when I run it in TestStand, I get an error -17001; Program Error. "Cannot allocate 0 size buffer Error in parameter 2, 'OpenFrdData'."
I've allocated the Array of structs, and all of the information is there before I call my function, so is it my prototype? Or am I asking too much of the DLL Flexible Prototype Adapter to pass an Array of Structs?
I can pass in a single struct of type TPS_Data and that works, but not an array.
Here's the relevent code:
typedef struct TPS_DATA
char Report_Number[256];
char System_Name[256];
char Open_Date[256];
char UUT_Part_Number[256];
char UUT_Serial_Number[256];
char UUT_Name[256];
char Open_Employee_Name[256];
char Open_Employee_Number[256];
char Close_Employee_Name[256];
char Close_Employee_Number[256];
char Close_Date[256];
} TPS_Data;
typedef struct TPS_DATA_ARRAY
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OK,
I can pass the data to the DLL function, using the following types:
typedef struct StringArrayType
char string[10][256];
} StringArray;
typedef struct MultiStringArrayType
StringArray Record[10];
} MultiStringArray;
void __declspec(dllexport) __stdcall ATP_TestStructPassing(StringArray Strings)
return;
void __declspec(dllexport) __stdcall ATP_TestMultiStructPassing(MultiStringArray *Strings)
return;
But when the MultiStruct function Exits, TestStand reports an Error:
-17501 "Unexpected Operating System Error" Source: 'TSAPI'
There doesn't seem to be a way around this, and once the error occurs, I have to force quit TestStand. I've included the sequence file, and the dll code can be compiled from the fun
ctions shown above.
Any thoughts on how to get around this error would be greatly appreciated.
Attachments:
StructArrayPassing.seq ‏16 KB

The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The event data contains the error.

got event ID 4015 and source DNS-Server-Service. please suggest how to fix this issue
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I'm getting a "The procedure entrypoint ssSr192x__ssSr192drvssSrReset could no be located in the dynamic link library ssSR192x.dll" because the ActiveX instrument driver DLL doesn't have the function names in the export table.

Is there a way for my CVI project to reference the functions in the ActiveX without including the instrument .fp in the project?
Thanks much.
I'm confused on how CVI uses ActiveX components and hope someone can help.
I'm using an ActiveX driver from an instrument manufacturer and I use the .TLB to generate a .fp, .c, and .h file. If I register the .dll and load the .fp in my project, all is well. Unfortunately in my application the functions to control this instrument are in another DLL whose .lib I include in my CVI projec
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Program structure with non-ActiveX DLLs:
CVI project (.exe with common.lib in project list)
|
V
Common DLL (MeasDMM() with hp1234.lib in project list)
|
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Instrument DLL (hp1234_measure())
Since I get a .c and .h file from the .TLB, I've tried recompiling the DLL (.dll and .lib produced) and the functions seem to work, but I get "Class not registered" errors unless I play games with the registry so I'm obviously violating numerous Microsoft rules!
Is there a way for my CVI project to reference the functions in the ActiveX without including the instrument .fp in the project? Thanks much.
Jeff Fish
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Hello Jeff,
Where were your getting the .lib file for the ActiveX DLL? Did you use the "hp1234"
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Jeremiah
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http://www.ni.com/ask

How to call the DLL functions through Java

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When I use Call Library Function Node in real time, is the DLL loaded once for all or load every time it is called?

When I use Call Library Function Node in real time, is the DLL loaded once for all or load every time when it is called?
I have a time critical real time application, in which I use a piece of DLL function developed by C++. It is OK? Could any senior developer assure me?
Thank you in advance.
Solved!
Go to Solution.

qing_shan61 wrote:
When I use Call Library Function Node in real time, is the DLL loaded once for all or load every time when it is called?
Once
qing_shan61 wrote:
I have a time critical real time application, in which I use a piece of DLL function developed by C++. It is OK?
OK
Be sure that all DLL calls are thread safe (do not perform calls in UI thread).
Also for real-time application you need real-time OS.
Andrey.

Renaming function contained @ in the DLL

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